CREST Practitioner Security Analyst (CPSA) Practice

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On which TCP Port does X11 primarily operate?

8080
6000
443
25

The correct answer is: 6000

X11, also known as the X Window System, primarily operates on TCP port 6000. This protocol is used for managing graphical displays on UNIX and Linux operating systems, allowing for the rendering of GUIs over a network. The choice of port 6000 is significant because it serves as the default port for the X server, which listens for incoming connections from X clients. Each subsequent display uses an incremented port number, starting with 6000 for display :0, 6001 for display :1, and so on. Understanding the port assignment is essential for security analysts as improper configuration or access control on this port can lead to unauthorized access to graphical user interfaces across the network. The other options, while associated with different services, do not pertain to X11: port 8080 is often used for alternative web services, port 443 is commonly associated with HTTPS, and port 25 is primarily used for SMTP (email transmission). Thus, 6000 is the clear choice for identifying the primary operational port for X11.